Function delete_boot_parameters 

pub async fn delete_boot_parameters(
    infra: &InfraContext<'_>,
    token: &str,
    hosts: Vec<String>,
) -> Result<(), Error>

Remove the BSS boot-parameter record for each host in hosts.

The caller’s access to every host is validated before the delete is dispatched. The constructed BootParameters carries only the host list — BSS keys deletions by host, so the other fields are intentionally empty.